I was on the other end of a similar situation. A local dealer in used equipment had just received a vintage amp and preamp that I wanted. His tech had not checked it yet. When I asked about it he said another customer was interested, but wanted a home trial and had to be sure his wife liked it.
I told him I wanted to buy it. When he asked if I wanted to hear it first, I said "No, as long as it works, I’ll buy it and pay cash." We agreed on the price and shook hands.
I had the equipment a few days later after the tech made sure it was working properly. I handed the seller cash.
You are either a buyer or someone who might buy it